Abstract
A plane surface enclosed or bounded by straight lines or a curved line is called a plane figure. The least number of straight lines which can enclose a space is three. When three straight lines intersect, the plane surface enclosed is a triangle. With four straight lines, the figure obtained is a quadrilateral. The most common plane figures are set squares (30°–60° and 45°). Other common plane figures include square, rectangle, pentagon, hexagon, octagon, circle, ellipse, etc.
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Rathnam, K. (2018). Projections of Plane Figures. In: A First Course in Engineering Drawing. Springer, Singapore. https://doi.org/10.1007/978-981-10-5358-0_8
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DOI: https://doi.org/10.1007/978-981-10-5358-0_8
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